git'n a system-desgin-primer

B4/Solutions/system_design/payment_processing/features.text

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+Payment Processing System:
+
+1. User: Represents a user with a balance.
+
+2. Transaction: Represents a payment transaction between users.
+
+3. PaymentProcessingSystem: Processes transactions and handles fund transfers.

B4/Solutions/system_design/payment_processing/payment.py

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+import random
+
+class User:
+    def __init__(self, user_id, name, balance):
+        self.user_id = user_id
+        self.name = name
+        self.balance = balance
+
+class Transaction:
+    def __init__(self, sender, receiver, amount):
+        self.transaction_id = random.randint(1000, 9999)
+        self.sender = sender
+        self.receiver = receiver
+        self.amount = amount
+
+class PaymentProcessingSystem:
+    def process_payment(self, transaction):
+        if transaction.sender.balance >= transaction.amount:
+            transaction.sender.balance -= transaction.amount
+            transaction.receiver.balance += transaction.amount
+            print(f"Transaction {transaction.transaction_id} successful: {transaction.sender.name} paid {transaction.receiver.name} ${transaction.amount}.")
+        else:
+            print(f"Transaction {transaction.transaction_id} failed: Insufficient funds.")
+
+# Example Usage
+user1 = User(1, "Alice", 100)
+user2 = User(2, "Bob", 50)
+
+payment_system = PaymentProcessingSystem()
+transaction = Transaction(user1, user2, 30)
+payment_system.process_payment(transaction)
+
+print(f"{user1.name}'s balance: ${user1.balance}")
+print(f"{user2.name}'s balance: ${user2.balance}")